6
3.4 Dip switch
4. Maintenance instructions
This chapter sets out the requirements and intervals for component inspections and maintenance.
The interval for unit inspections must not exceed one year.
4.1 Filter change
A timer indicates when it is time to inspect the filter. The LED ”Filter” flashes when the specified
time has passed (only counts when the fans are switched on). The LED may be switched off by
pressing the button ”Reset” which also resets the counter. By means of a dip switch, the timer may
be set to off, 3 ,6 ,9 and 12 months, respectively
.
4.1.1 Internal filter
The filter is changed when required or at filter alarm.
4.1.2 External filter
The external filter is changed when required or at filter alarm.
